I am using canvas a1 since september 2014. Its been more than 1 year. Till now no lag no hanging problems occured. I use it very much for net and gaming. I love my phone. Camera and battery backup is decent. Currently it is running android M 6.0 . It gets uodate very fast . Phone looks very beautiful and is very slim. I really feel very good holding thisphone in my hands.
Pros:-
1) nice display
2) lightweight phone
3)latest Android version, currently 6.0
4) sound quality and video quality is nice(in this 5k range)
Cons:-
1) A bit heating problem in heavy games playing( playing ashphalt nitro)
2) rear camera is not the best, in this price
3) sometimes network problem occurs